Classification of Stars

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  • The main characteristics used to classify stars are size, temperature, and the brightness.


Size:
White Dwarf
White Dwarf

Siruis is the 2nd brightest star
Siruis is the 2nd brightest star



  • Many stars are usually the size of the Sun: medium sized.
  • Some stars are much larger than the Sun which are called "giant stars".
  • Some are smaller than the Sun. For example, the white dwarf is about the size of Earth.
Temperature:
  • A star's color reveals it's temperature.
    Red stars mean it's cool
    Red stars mean it's cool
  • The coolest stars are reddish in the sky.
  • The hottest stars are blueer than the sky.


Brightness:
  • The brightness of the star depends on it's size and temperature.
  • A very large star shines brightly.
  • A star's brightness is described in 2 different way.